Enhanced dielectric properties of BaTiO3/PVDF composites and its film capacitor application
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摘要: 选用柔性高分子材料聚偏氟乙烯(PVDF)作为基体, 纳米钛酸钡陶瓷(BaTiO3)作为填充相, 采用简单的溶液共混以及流延工艺制备BaTiO3/PVDF薄膜。通过SEM观察了复合材料体系的微观结构, 研究了BaTiO3/PVDF介电复合材料的介电性能。把所制备的BaTiO3/PVDF复合材料薄膜(70 mm×30 mm×25 μm, 电极面积: 600 mm2)加工成卷绕式薄膜电容器, 研究了该电容器的电容、损耗、击穿电压以及温度稳定性等性能。结果表明, BaTiO3/PVDF复合材料具有良好的介电性能, 其薄膜电容器性能优异, 电容值为3.34 nF, 损耗低于0.03, 在测试频率范围内保持稳定, 击穿电压达到1.3 kV, 并且在100 ℃以内能保持良好的电容性能。Abstract: BaTiO3/PVDF (polyvinylidene fluoride) composites films, with PVDF as matrix, nanometer sized BaTiO3 as fillers, were prepared by a simple mix and casting process. The microstructure of the BaTiO3/PVDF composites were examined by SEM, and the dielectric properties of samples were discussed. BaTiO3/PVDF composites (film size: 70 mm×30 mm×25 μm, electrode area: 600 mm2) were applied in the film capacitors, and the key parameters of capacitor including capacitance, loss, thermal stability and breakdown voltage were tested. The results show that the BaTiO3/PVDF film capacitors have the good thermal stability below 100 ℃ and high breakdown voltage(1.3 kV), while the capacitance can reach 3.34 nF and the loss is below 0.03.
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Key words:
- composites /
- BaTiO3 /
- polyvinylidene fluoride /
- dielectric properties /
- film capacitor /
- capacitance
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